- Alternanthera philoxeroides is an emergent or rooted floating plant that invades aquatic areas and adjoining uplands throughout the southern portions of the United States. Plants have hollow stems and can grow to 3 ft. (1 m) tall.
- Opposite, elliptical leaves are thick but non-succulent and are up to 4 in. (10 cm) long.
- Flowering occurs during the summer with white, clover-like heads in the axils of the leaves.
- Fruits are very small, and single-seeded.
- Ecological Threat
- Alternanthera philoxeroides roots in wet soils or shallow water and grows out into waterways. Alternanthera philoxeroides can also grow terrestrially, forming smaller, tougher leaves. The thick mats can displace native vegetation and wildlife habitat, clog waterways, restrict oxygen levels of water, increase sedimentation, interfere with irrigation and prevent drainage. It is native to South America and was first introduced into the United States around 1900 in ballast water.
- Biological Control of Invasive Plants in the Eastern United States - USDA Forest Service
- Invasive Alien Plant Species of Virginia - Virginia DCR and Virginia Native Plant Society
- Global Invasive Species Database - Invasive Species Specialist Group
- Images, Video and Information - University of Florida - Center for Aquatic and Invasive Plants
Image Sets View other image sets:
EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.
|No Data for this state|
|Troublesome or Common weed in one or more crops|
Invasive Listing Sources
- Alabama Invasive Plant Council
- Alabama Noxious Weeds - Class C Noxious Weed
- Alachua County Cogongrass Initiative
- Apalachicola Invasive Working Group - Low
- Arizona Noxious Weeds
- California Invasive Plant Council
- California Noxious Weeds
- East Central Florida CISMA
- Eric Ulaszek, U.S. Forest Service, Midewin National Tallgrass Prairie, Illinois
- Faith Campbell, 1998
- Florida Exotic Pest Plant Council - Category II
- Georgia Exotic Pest Plant Council - Category 1
- Gulf of Mexico Regional Panel, Aquatic Nuisance Species Annual Report, 2001
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- North Carolina Division of Parks and Recreation, Department of Environment and Natural Resources, 1998
- South Carolina Noxious Weeds
- Tennessee Exotic Pest Plant Council
- Texas Noxious Weeds
- Treasure Coast Cooperative Invasive Species Mgmt. Area - EARLY DRAFT
- Virginia Invasive Plant Species List
- WeedUS - Database of Plants Invading Natural Areas in the United States
Other System LinksPlants: ALPH
NPDN Pest: PAFABBA
NPDN Host: 31794
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|